Power, authority.
Concentration; strength
Sexual virility: the ability to become erect or achieve orgasm.
Potentiality, ability, capacity.
The ability or capacity to perform something
State of having legal force.
The genuinity - as distinguished from the efficacity or the regularity - of a sacrament as a result of some formal dispositions being fulfilled.
The state of being valid, authentic or genuine.
A quality of a measurement indicating the degree to which the measure reflects the underlying construct, that is, whether it measures what it purports to measure (see reliability).